Calculator flap book cover



FIG. 1 is a top plan view of the inside of a calculator flap book cover showing my new design;

FIG. 2 is a bottom plan view thereof; and,

FIG. 3 is a top plan view thereof, with the flap in a closed position.

The broken lines in FIG. 3 are for illustrative purposes only and form no part of the claimed design. The claim as disclosed is understood to be of conventional thickness. 

The ornamental design for a calculator flap book cover, as shown and described. 